Device for protecting boiler-tubes



(No Model.) V

.. W. HAGUE & W. B. OOOKSON.

DEVICE FOR PROTECTING BOILERTUBES. No. 370.865. Patented Oct. 4, 1887.

N. PETERS. Fhoip-Litbagnphur. Wahinglon. D. C.

UNITED STATES PATENT OFFICE.

WALTER HAGUE AND WILLIAM BOWMAN OOOKSON, OF PITTSBURG, AS-

SIGNORSOF ONE-THIRD TO JOHN OMMERT, OF ALLEGHENY COUNTY,

PENNSYLVANIA.

SPECIFICATION forming part 01' Letters Patent No. 370,865, dated Qctober4, 1887.

Application filed June 22, 1857. Serial No. 242,178. (No model.)

tion of the invention, such as will enable others skilled in the art towhich it pertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification.

Our invention relates to an improved device for protecting andequalizing the temperature of the front portion of boiler-tubes, theobject being to provide a means whereby that portion of the boiler-tubessubjected to the greatest heat may be protected or shielded, thereby tosome extent equalizing the temperature of the tubcs,which allows thesame to expand and contract more evenly,which being the case willpreventleakage at that point; and with this end in view ourinventionconsistsin a corrugated shield or inner cover placed in the endof each tube at the point of connection with the firebox of the boiler,together with certain details of construction and combination of parts,as

0 will be fully described hereinafter.

In the accompanying drawings, Figure l is a sectional elevation of aportion of a boilertube attached to the rear wall of a fire-boxsuch asare now in common use-and having 5 attached thereto one of our improvedprotectors constructed in accordance with our invention. Fig. 2 is aperspective view of our. im-

provement detached from the tube.

To put our invention into practice with the 0 ordinary boiler-tubes, a,attached to the rear wall, I), of a fire box forming a part of a loco:motive or other boiler, we provide a short section of a tube, 0,somewhat less in diameter than the boiler-tubes. The section 0 is corrugated at ein the direction of its length and provided with anoutwardly-projecting flange, f. This section 0 we divide by a singleout, 9, extending lengthwise of the same, for the double purpose ofallowing the section 0 to frcelyexpand and contract and be easilyentered into the tubes a.

If desired, the sections 0 may be constructed without the corrugationse, as a plain surface will answer the purpose.

In all tubular boilers ithas been ascertained by actual practice thatthe first leakage of the boiler will take place at the intersection ofthe front portion of the tubes at with the fire-box,

which portions are subjected to an intense.

heat, being in close contact with the lire, therefore expanding andcontracting unevenly with the other part of the tubes a. To obviate thiswe secure a shield or protector, 0, such as described, in each of thetubes at at a point where the same is secured to the fire-chamber; Thecorrugations 6 along the sides of the shield c serve to hold the sameaway from the inner wall of the tube a, leaving a space, h, throughwhich a current of air may circulate, thus protecting the tubes a andequalizing the term perature of the same.

Having thus described our invention, what we claim, and desire to secureby Letters Patcut, is-- In combinatiou'with a boiler tire tube, thecorrugated section 0, provided with an outwardly-projecting flange, f,and cut or divided along one side in the direction of its length, as andfor the purpose described.

WALTER HAGUE. WILLIAM BOWMAN COOKSONv Witnesses:

JOSIAH W. ELLs, M. E. HARRISON.

